GB1156865A - Identification Circuit for PAL System Conversion of Tape. - Google Patents

Identification Circuit for PAL System Conversion of Tape.

Info

Publication number
GB1156865A
GB1156865A GB4210/67A GB421067A GB1156865A GB 1156865 A GB1156865 A GB 1156865A GB 4210/67 A GB4210/67 A GB 4210/67A GB 421067 A GB421067 A GB 421067A GB 1156865 A GB1156865 A GB 1156865A
Authority
GB
United Kingdom
Prior art keywords
signal
phase
subcarrier
binary
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4210/67A
Inventor
Peter Swift Carnt
Theodore Ernest Bart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RCA Corp, Radio Corporation of America filed Critical RCA Corp
Priority to GB4210/67A priority Critical patent/GB1156865A/en
Priority to US676479A priority patent/US3538244A/en
Priority to DE19681537991 priority patent/DE1537991B2/en
Priority to ES349733A priority patent/ES349733A1/en
Priority to NL6801214.A priority patent/NL161026C/en
Publication of GB1156865A publication Critical patent/GB1156865A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/87—Regeneration of colour television signals
    • H04N9/873—Regeneration of colour television signals for restoring the colour component sequence of the reproduced chrominance signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation
    • H04N9/465—Synchronisation of the PAL-switch
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/87—Regeneration of colour television signals
    • H04N9/89—Time-base error compensation

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Television Signal Processing For Recording (AREA)
  • Color Television Systems (AREA)

Abstract

1,156,865. Colour television. RADIO CORPORATION OF AMERICA. 29 Jan., 1968 [27 Jan., 19671, No. 4210/67. Heading H4F. To adapt the NTSC type automatic time correction (ATC) circuit in a colour video tape recorder for recorded PAL type signals, the colour burst signals of which vary from lineto-line by Œ45 degrees from a reference phase, the ATC circuit, which under NTSC signal playback operation compares the separated 12 subcarrier burst component of the recorded colour video signal with a locally generated reference wave at subcarrier frequency in a phase detector 14, the resultant error signal being used to control a variable delay line 16, is also arranged to produce a further error signal which is used to synchronize the sense of the periodic phase shift 18 of the reference subcarrier with that of the subcarrier burst component of the recorded PAL signal. If the sense of the periodic phase shift of the reference subcarrier is incorrect, i.e. phase of the reference subcarrier is cyclically out-of-phase with the phase of the recorded subcarrier burst, the error signal includes a square wave of half horizontal line scan frequency which is filtered, amplified and clipped 22-28, and fed to a diode pump type divider or counter detector stage 30 which produces a reset pulse after approximately ten square wave pulses. The reset pulse is coupled to a half line frequency binary 20 which controls the phase shifter 18, binary 20 being triggered by a locally generated horizontal sync. signal. Detector 30 prevents accidental resetting of binary 20 by spurious signals of large amplitude, and is such that its counting number increases as the amplitude of the counter input signal decreases, i.e. the further the frequency of any spurious signal is away from half horizontal scan frequency and due to the selectivity of filter 22, the lower is the amplitude of the resultant signal and the higher the count number before the counter is fired and binary 20 is reset.
GB4210/67A 1967-01-27 1967-01-27 Identification Circuit for PAL System Conversion of Tape. Expired GB1156865A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB4210/67A GB1156865A (en) 1967-01-27 1967-01-27 Identification Circuit for PAL System Conversion of Tape.
US676479A US3538244A (en) 1967-01-27 1967-10-19 Identification circuit for phase alternating line system operation of color video tape recorders
DE19681537991 DE1537991B2 (en) 1967-01-27 1968-01-23 IDENTIFICATION CIRCUIT FOR AN AUTOMATIC PHASE CONTROL SETTING UP A VIDEO TAPE RECEIVER FOR COLOR TV SIGNALS
ES349733A ES349733A1 (en) 1967-01-27 1968-01-25 Identification circuit for phase alternating line system operation of color video tape recorders
NL6801214.A NL161026C (en) 1967-01-27 1968-01-26 CHAIN IDENTIFIER FOR AN AUTOMATIC TIME CORRECTION CHAIN IN A PAL COLOR VIDEO REGISTRATION DEVICE.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4210/67A GB1156865A (en) 1967-01-27 1967-01-27 Identification Circuit for PAL System Conversion of Tape.

Publications (1)

Publication Number Publication Date
GB1156865A true GB1156865A (en) 1969-07-02

Family

ID=9772818

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4210/67A Expired GB1156865A (en) 1967-01-27 1967-01-27 Identification Circuit for PAL System Conversion of Tape.

Country Status (5)

Country Link
US (1) US3538244A (en)
DE (1) DE1537991B2 (en)
ES (1) ES349733A1 (en)
GB (1) GB1156865A (en)
NL (1) NL161026C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3806637A (en) * 1972-10-30 1974-04-23 Hazeltine Research Inc Apparatus for resolving phase ambiguities in regenerated carrier signals
US4352121A (en) * 1980-04-08 1982-09-28 Ampex Corporation PAL Burst phase shift error corrector
JPS5750189A (en) * 1980-09-09 1982-03-24 Sony Corp Magnetic recording and playback device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735886A (en) * 1956-02-21 Color television system
NL136577C (en) * 1962-03-30
DE1239723B (en) * 1965-07-22 1967-05-03 Telefunken Patent Circuit arrangement for compensating for phase errors in a color carrier taken from a recording medium

Also Published As

Publication number Publication date
NL161026B (en) 1979-07-16
DE1537991A1 (en) 1970-05-06
US3538244A (en) 1970-11-03
NL6801214A (en) 1968-07-29
DE1537991B2 (en) 1972-02-17
NL161026C (en) 1979-12-17
ES349733A1 (en) 1969-05-01

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee